Terminals TB2-11 and TB2-12 are provided for ®eld in- stallation of a chilled water (¯uid) pump interlock (CWPI) and a chilled water (¯uid) ¯ow switch (CWFS). These de- vices are to be installed in series. Contacts must be rated for day circuit applications capable of handling a 24-vac to 50 mA load.

Accessory remote on-off switch can be wired into TB2-13 and TB2-14. To use this feature, remove the factory-installed jumper and install the device in series. See Fig. 13 for re- mote on-off, CWPI, and CWFS wiring. Contacts must be rated for dry load application capable of handling a 24-vac to 50 mA load.

Do not use interlocks or other safety device contacts connected between TB2 terminals 13 and 14 as remote on-off. Connection of safeties or other interlocks be- tween these 2 terminals will result in an electrical bypass if the REMOTE-OFF-LOCAL switch is in the LOCAL position. If remote on-off unit control is re- quired, a ®eld-supplied relay must be installed in the unit control box and wired as shown in Fig. 13. Failure to wire the remote on-off as recommended will result in tube freeze damage.

Terminals 2 and 3 of TB2 have been provided for a ®eld-supplied remote alarm (ALM). If an audible alarm is installed, an alarm shutoff is also recommended. Contacts are rated for 125 va at either 115 or 230 v control power. See Fig. 13.

Terminals 4 and 5 of TB2 have been provided for a ®eld-supplied chilled water (¯uid) pump relay (CWP). A ®eld-supplied power supply of appropriate voltage must be provided. Contacts are rated for 125 va at either 115 or 230 v control power. See Fig. 13.

Terminals 1 and 6 of TB2 have been provided for a ®eld-supplied control relay for the remote condenser (30HXA) or a condenser pump relay (30HXC). A ®eld-supplied power supply of appropriate voltage must be provided.

Step 5 Ð Install Accessories

ELECTRICAL Ð Several optional control accessories are available to provide the following features:

·control transformer

·cooler pump/¯ow switch interlock

·cooler pump control

·expanded display panel

·remote alarm

·remote on-off

·pulldown control

·occupancy scheduling

·demand limit control

·temperature reset (from occupied space or outdoor-air temperature)

·dual set point control

·condenser water sensors

·level II communications (CCN [Carrier Comfort Network])

Refer to Start-Up and Operation literature and sepa- rate accessory installation instructions for additional information.

30HXA LOW-AMBIENT OPERATION Ð If outdoor ambient operating temperatures below 60 F (15 C) are ex- pected, refer to separate installation instructions for low- ambient operation using accessory Motormaster III control.

MINIMUM LOAD ACCESSORY Ð If minimum load accessory is required, use the appropriate package. Refer to unit Price Pages or contact your local Carrier representative for more details. For installation details, refer to separate in- stallation instructions supplied with the accessory package.

MISCELLANEOUS ACCESSORIES Ð For applications re- quiring special accessories, the following packages are avail- able: control power transformer, minimum load control, sound reduction enclosure, external vibration isolation, expanded display, Victaulic-type connections, temperature reset sen- sor, and chilled ¯uid ¯ow switch. Refer to individual acces- sory installation instructions for installation details.

Step 6 Ð Leak Test Unit

30HXC UNIT Ð These units are shipped from the factory with a full charge of R-134a (See Tables 1A and 1B). Per- form a leak test to ensure that leaks have not developed during unit shipment. Dehydration of the system is not re- quired unless the entire refrigerant charge has been lost. There are a number of Swage-Lok ®ttings used on the refrigerant piping. If a leak is detected at any of these ®ttings, tighten outside nut 1¤8 turn.

DO NOT OVERTIGHTEN THESE FITTINGS. Over- tightening will result in the tube being crushed and will cause a refrigerant system leak.

30HXA UNITS Ð These units are shipped with a holding charge of R-134a. Leak test and dehydrate the complete sys- tem (including both ®eld and factory installed piping).

Step 7 Ð Refrigerant Charge

IMPORTANT: These units are designed for use with R-134a only. DO NOT USE ANY OTHER refrig- erant in these units without ®rst consulting your Carrier representative.

The liquid charging method is recommended for com- plete charging or when additional charge is required.

When charging, circulate water through the condens- er and cooler at all times to prevent freezing. Freezing damage is considered abuse and may void the Carrier warranty.

DO NOT OVERCHARGE system. Overcharging re- sults in higher discharge pressure with higher cooling ¯uid consumption, possible compressor damage, and higher power consumption.

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Carrier HXC076-186, 30HXA installation instructions Install Accessories

30HXA, HXC076-186 specifications

The Carrier 30HXA and 30HXC series is a notable line of chillers designed for commercial applications, providing advanced cooling solutions for various buildings and infrastructures. These models are known for their reliability and efficiency, making them a preferred choice for building managers and facilities engineers.

One of the key features of the Carrier 30HXA and 30HXC series is their use of high-efficiency, variable-speed scroll compressors. This technology allows the chillers to adjust their cooling output based on the actual demand, resulting in significant energy savings, especially during periods of partial load. This responsiveness not only leads to lower operational costs but also reduces wear and tear on the equipment, extending its lifespan.

Another critical aspect of these chillers is their eco-friendly refrigerant options. The 30HXA and 30HXC models utilize R-410A refrigerant, which has a lower environmental impact compared to traditional refrigerants. This commitment to sustainability aligns with modern regulations and climate goals, making these chillers an environmentally responsible choice.

Both series offer a wide range of cooling capacities, from 76,000 to 186,000 BTU/h, catering to various commercial needs. The compact design and modular configurations of these chillers allow for easy installation and integration into existing systems, facilitating retrofits and upgrades without significant disruption.

The 30HXA and 30HXC chillers also feature advanced controls that enhance their operational efficiency. The integrated controls allow for easy monitoring and adjustments, enabling users to optimize performance and minimize energy consumption. Additionally, they can easily interface with building management systems (BMS), providing real-time data and improved operational insights.

Durability is another hallmark of the Carrier 30HXA and 30HXC series. Built with corrosion-resistant materials and designed to withstand harsh weather conditions, these chillers ensure reliable performance in various environments. The robust construction further enhances their longevity, providing consistent cooling solutions for years.

In summary, the Carrier 30HXA and 30HXC series chillers offer advanced technology, eco-friendly refrigerants, energy efficiency through variable-speed compressors, and durable construction. These features come together to provide a reliable and effective cooling solution for a wide range of commercial applications, ensuring comfort and performance while supporting sustainability goals.